U.S. patent number 8,191,752 [Application Number 12/956,312] was granted by the patent office on 2012-06-05 for surgical instrument having a plastic surface.
This patent grant is currently assigned to Tyco Healthcare Group LP. Invention is credited to Paul A. Scirica.
United States Patent |
8,191,752 |
Scirica |
June 5, 2012 |
Surgical instrument having a plastic surface
Abstract
A surgical instrument including a handle portion, a body
portion, a movable handle, a tool assembly, a drive beam and a
closure apparatus is disclosed. At least one of the closure
apparatus and a contact surface of the tool assembly include a
plastic surface. The body portion extends distally from the handle
portion. The movable handle is located on the handle portion and is
in mechanical cooperation with a drive member. The tool assembly
includes an anvil, a cartridge assembly and a contact surface. The
drive beam includes a proximal engagement portion and is configured
to engage a portion of the drive member. The closure apparatus is
configured to engage the contact surface of the tool assembly. At
least a partial actuation of the movable handle moves the closure
apparatus distally into engagement with the contact surface to
approximate the anvil and the cartridge assembly.
Inventors: |
Scirica; Paul A. (Huntington,
CT) |
Assignee: |
Tyco Healthcare Group LP
(Mansfield, MA)
|
Family
ID: |
62142931 |
Appl.
No.: |
12/956,312 |
Filed: |
November 30, 2010 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20110073633 A1 |
Mar 31, 2011 |
|
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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11544982 |
Oct 6, 2006 |
7845535 |
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Current U.S.
Class: |
227/176.1;
227/178.1; 227/180.1 |
Current CPC
Class: |
A61B
17/105 (20130101); A61B 17/068 (20130101); A61B
17/115 (20130101); A61B 17/07207 (20130101); A61B
17/072 (20130101); A61B 2017/320052 (20130101); A61B
2017/0084 (20130101); A61B 2017/0046 (20130101); A61B
2017/00845 (20130101); A61B 2017/2946 (20130101); A61B
2017/0023 (20130101); A61B 2017/2902 (20130101); A61B
2017/00853 (20130101); A61B 2017/2936 (20130101); A61B
2017/2943 (20130101); A61B 2017/07271 (20130101); A61B
2017/00964 (20130101); A61B 2017/00526 (20130101); A61B
2017/07278 (20130101); A61B 2017/2927 (20130101); A61B
17/0686 (20130101); A61B 2017/07214 (20130101); A61B
2017/00473 (20130101); A61B 2017/07285 (20130101) |
Current International
Class: |
A61B
17/10 (20060101) |
Field of
Search: |
;227/175.1-175.4,176.1,177.1,178.1,179.1,180.1,181.1,182.1 |
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May 1990 |
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EP |
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0373762 |
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EP |
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0380025 |
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EP |
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0399701 |
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EP |
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0449394 |
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EP |
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0484677 |
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EP |
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0489436 |
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Other References
Product Code 030735--photos of product (5 pages), the product
catalog (5 pages) and product package (1 page). cited by other
.
Michaem Hansen, Overmolding: A Multifaceted Medical Device
Technology, Jan. 2006, Reprinted from Medical Device &
Diagnostic industry, Canon Communications LLC. cited by other .
European Search Report for EP 07253815.0 date of completion is Aug.
27, 2009 (4 pgs). cited by other .
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|
Primary Examiner: Truong; Thanh
Parent Case Text
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a divisional of U.S. application Ser. No.
11/544,982 filed Oct. 6, 2006, now U.S. Pat. No. 7,845,535, and the
disclosures of each of the above-identified applications are hereby
incorporated by reference in their entirety.
Claims
What is claimed is:
1. A disposable loading unit, comprising: a drive beam having a
proximal engagement portion disposed adjacent a proximal end
thereof, the drive beam defining a first longitudinal axis; a tool
assembly including an anvil defining a first contact surface, and a
cartridge assembly defining a second contact surface, wherein the
first and second contact surfaces are at least partially formed
from metal, the tool assembly being disposed distally of the drive
beam and defining a second longitudinal axis; and a closure
apparatus being formed from metal disposed adjacent a distal end of
the drive beam, the closure apparatus including a first portion
configured and dimensioned to engage the first contact surface of
the tool assembly, and a second portion configured and dimensioned
to engage the second contact surface of the tool assembly, whereby
distal movement of the drive beam moves the closure apparatus
distally into engagement with the first and second contact surfaces
to approximate the anvil and the cartridge assembly, wherein the
first and second portions of the closure apparatus each include a
plastic overmold to minimize friction between the first and second
portions of the closure apparatus and the first and second contact
surfaces of the tool assembly.
2. The disposable loading unit of claim 1, wherein the closure
apparatus includes at least one plastic cap at least partially
covering a portion thereof.
3. The disposable loading unit of claim 2, wherein the plastic cap
covers at least one horizontal surface of the closure
apparatus.
4. The disposable loading unit of claim 1, wherein at least a
portion of the closure apparatus is made of plastic.
5. The disposable loading unit of claim 1, wherein at least a
portion of the closure apparatus is overmolded with plastic.
6. The surgical instrument of claim 1, wherein the closure
apparatus includes an, I-shaped cross section.
7. The disposable loading unit of claim 1, wherein at least a
portion of the contact surface and at least a portion of the
closure apparatus include a plastic surface thereon.
8. The disposable loading unit of claim 1, wherein the drive beam
includes a plurality of layers.
9. The disposable loading unit of claim 1, wherein the tool
assembly being movable from a first position in which the second
longitudinal axis is substantially aligned with the first
longitudinal axis to a second position in which the second
longitudinal axis is disposed at an angle to the first longitudinal
axis.
10. A disposable loading unit, comprising: a drive beam; a tool
assembly disposed distally of the drive beam, the tool assembly
including an anvil and a cartridge assembly which are pivotally
connected for movement between open and closed positions, the anvil
defining a first contact surface and the cartridge assembly
defining a second contact surface, the first and second contact
surfaces being formed from metal; and a closure apparatus disposed
adjacent a distal end of the drive beam, the closure apparatus
including an upper portion configured and dimensioned to engage the
anvil and a lower portion configured and dimensioned to engage the
cartridge assembly such that distal movement of the closure
apparatus moves the anvil and the cartridge assembly from the open
position to the closed position, the closure apparatus further
including a first plastic surface positioned between the upper
portion and the anvil to reduce friction therebetween during distal
movement of the closure apparatus, and a second plastic surface
positioned between the lower portion and the cartridge assembly to
reduce friction therebetween during distal movement of the closure
apparatus to thereby facilitate a reduction in firing force.
11. The disposable loading unit of claim 10, wherein the upper and
lower portions of the closure apparatus are connected by an
intermediate portion positioned therebetween, the upper and lower
portions extending outwardly of the intermediate portion such that
the upper portion defines an upper horizontal portion and the lower
portion defines a lower horizontal portion.
12. The disposable loading unit of claim 11, wherein the first
plastic surface covers the upper horizontal portion and the second
plastic surface covers the lower horizontal portion.
13. The disposable loading unit of claim 11, wherein the first
plastic surface includes a first reinforced section configured and
dimensioned for engagement with the intermediate portion of the
closure apparatus, and the second plastic surface includes a second
reinforced section configured and dimensioned for engagement with
the intermediate portion of the closure apparatus, whereby the
first and second reinforced sections minimize relative movement
between the first plastic surface and the upper portion of the
closure apparatus, and minimize relative movement between the
second plastic surface and the lower portion of the closure
apparatus.
14. The disposable loading unit of claim 11, wherein the
intermediate portion includes a cutting surface.
15. The disposable loading unit of claim 10, wherein the first
plastic surface is removably connected to the upper portion of the
closure apparatus, and the second plastic surface is removably
connected to the lower portion of the closure apparatus.
Description
TECHNICAL FIELD
The present disclosure relates to a surgical instrument and
disposable loading unit including a plastic surface thereon. More
particularly, the present disclosure relates to a surgical
instrument which includes a plastic surface on at least one of a
closure apparatus and a contact surface of a tool assembly.
BACKGROUND
Surgical devices wherein tissue is first grasped or clamped between
opposing jaw structure and then joined by surgical fasteners are
well known in the art. In some instruments, a knife is provided to
cut the tissue which has been joined by the fasteners. The
fasteners are typically in the form of surgical staples but two
part polymeric fasteners can also be utilized.
Instruments for this purpose may include two elongated members
which are respectively used to capture or clamp tissue. Typically,
one of the members carries a staple cartridge that houses a
plurality of staples arranged in at least two lateral rows while
the other member has an anvil that defines a surface for forming
the staple legs as the staples are driven from the staple
cartridge. In some instruments, the closure of the two elongated
members, or tool assembly, is affected by actuation of a movable
handle which moves a drive beam having a closure apparatus thereon
into a contact surface of a tool assembly, thus approximating the
members of the tool assembly. A large frictional force may be
present between the closure apparatus and the contact surface of
the tool assembly, thus possibly requiring a relatively large
amount of force to be applied to the movable handle.
SUMMARY
The present disclosure relates to a surgical instrument including a
handle portion, a body portion, a movable handle, a tool assembly,
a drive beam and a closure apparatus, where at least one of the
closure apparatus and a contact surface of the tool assembly
include a plastic surface. The body portion extends distally from
the handle portion and defines a first longitudinal axis. The
movable handle is located on the handle portion and is in
mechanical cooperation with a drive member. The tool assembly is
supported adjacent a distal end of the body portion and includes an
anvil, a cartridge assembly and a contact surface. The drive beam
includes a proximal engagement portion located adjacent a proximal
end thereof and is configured to engage a portion of the drive
member. The closure apparatus is located adjacent a distal end of
the drive beam and is configured to engage the contact surface of
the tool assembly and includes a cutting surface in a disclosed
embodiment. At least a partial actuation of the movable handle
moves the closure apparatus distally into engagement with the
contact surface to approximate the anvil and the cartridge
assembly.
In an embodiment, the closure apparatus includes at least one
plastic cap at least partially covering a portion of the closure
apparatus, e.g., a horizontal surface. It is disclosed that at
least a portion of the closure apparatus is made of plastic or
overmolded with plastic.
In a disclosed embodiment, the drive beam includes a plurality of
layers. It is also disclosed that the closure apparatus has an
I-shaped cross section.
In an embodiment, the tool assembly defines a second longitudinal
axis and is movable from a first position where the second
longitudinal axis is substantially aligned with the first
longitudinal axis to a second position in which the second
longitudinal axis is disposed at an angle to the first longitudinal
axis. In this embodiment, the tool assembly is able to be
articulated.
In an embodiment, the closure apparatus is part of a disposable
loading unit. The present disclosure also relates to a disposable
loading unit that includes features of the closure apparatus and
the tool assembly, as described above
DESCRIPTION OF THE DRAWINGS
Various embodiments of the presently disclosed surgical instrument
are disclosed herein with reference to the drawings, wherein:
FIG. 1 is a side perspective view from the distal end of one
embodiment of the presently disclosed surgical instrument with
articulating tool assembly;
FIG. 1A is a side perspective view from the proximal end of a
disposable loading unit (DLU) of the surgical instrument shown in
FIG. 1 including the tool assembly;
FIG. 2 is a side perspective view of the distal end of mounting
assembly and tool assembly, with parts separated, of the DLU of the
surgical instrument shown in FIG. 1;
FIG. 3 is a side perspective view of the mounting assembly and the
proximal body portion of the DLU shown in FIG. 1A with parts
separated;
FIG. 3A is a side perspective view of a coupling member of the
surgical instrument shown in FIG. 1;
FIG. 3B is a side perspective view of an upper mounting portion of
the mounting assembly of the DLU of the surgical instrument shown
in FIG. 1;
FIG. 3C is a side perspective view of a lower mounting portion of
the mounting assembly of the DLU of the surgical instrument shown
in FIG. 1;
FIG. 3D is a side perspective view from above the proximal body
portion, the mounting assembly and the tool assembly of the DLU of
the surgical instrument with the tool assembly in its
non-articulated position;
FIG. 3E is a side perspective view from above the proximal body
portion, the mounting assembly and the tool assembly shown in FIG.
3D with the tool assembly in an articulated position;
FIG. 3F is a side perspective view from below the proximal body
portion, the mounting assembly and the tool assembly of the DLU of
the surgical instrument with the tool assembly in its
non-articulated position;
FIG. 3G is a side perspective view from below the proximal body
portion, the mounting assembly and the tool assembly shown in FIG.
3F with the tool assembly in an articulated position;
FIG. 4 is a side cross-sectional view of the tool assembly of the
DLU shown in FIG. 1A;
FIG. 5 is a top perspective view of the lock member actuator of the
proximal body portion locking mechanism shown in FIG. 3;
FIG. 6 is a bottom perspective view of a locking member of the
locking mechanism shown in FIG. 3;
FIG. 7 is a top view of the proximal end of the DLU proximal body
portion shown in FIG. 1A with the locking mechanism in its locked
position;
FIG. 8 is a cross-sectional view taken along section lines 8-8 of
FIG. 7;
FIG. 9 is a top view of the proximal end of the DLU proximal body
portion shown in FIG. 1A with the locking mechanism in its unlocked
position;
FIG. 10 is a cross-sectional view taken along section lines 10-10
of FIG. 9;
FIG. 11 is a side perspective view of the DLU and surgical
instrument shown in FIG. 1 prior to attachment of the DLU to the
surgical instrument;
FIG. 12 is a top view of the proximal end of the DLU and the distal
end of the surgical instrument shown in FIG. 11 prior to attachment
to the distal end of the surgical instrument;
FIG. 13 is a top view of the proximal end of the DLU shown in FIG.
11 as the DLU is advanced linearly into the distal end of the
surgical instrument;
FIG. 14 is a top view of the proximal end of the DLU and the distal
end of the surgical instrument shown in FIG. 12 after the DLU has
been advanced linearly but prior to locking the DLU to the surgical
instrument;
FIG. 15 is a top view of the proximal end of the DLU and the distal
end of the surgical instrument shown in FIG. 13 after the DLU has
been advanced linearly and rotatably locked onto the surgical
instrument;
FIG. 16 is a perspective view of a locking assembly for use with a
surgical instrument in accordance with an embodiment of the present
disclosure;
FIG. 17 is a perspective view of various components of the locking
assembly of FIG. 16;
FIG. 18 is an enlarged perspective view of a portion of the locking
assembly of FIGS. 16 and 17 illustrated with the articulating tool
assembly in a non-articulated position;
FIG. 19 is an enlarged perspective view of a portion of the locking
assembly of FIGS. 16-18 and including a link;
FIG. 20 is an enlarged perspective view of a portion of the locking
assembly of FIGS. 16-19 illustrated with the articulating tool
assembly in an articulated position;
FIG. 21 is an enlarged perspective view of another locking assembly
for use with a surgical instrument in accordance with an embodiment
of the present disclosure;
FIG. 22 is an enlarged bottom perspective view of the locking
assembly of FIG. 21;
FIG. 23 is a perspective view of a drive beam having a plurality of
layers and a closure apparatus in accordance with an embodiment of
the present disclosure;
FIG. 24 is a perspective view of the drive beam and closure
apparatus of FIG. 23 with parts separated;
FIG. 25 is a cross-sectional view of a portion of the drive beam
and closure apparatus of FIGS. 23 and 24;
FIG. 26 is a cross-sectional view of a drive beam and a closure
apparatus in accordance with an embodiment of the present
disclosure;
FIG. 27 is a cross-sectional view of the drive beam and closure
apparatus of FIG. 26;
FIG. 28 is a perspective view of a tool assembly in accordance with
an embodiment of the present disclosure; and
FIG. 29 is an assembly view of the tool assembly of FIG. 28.
DETAILED DESCRIPTION OF EMBODIMENTS
Embodiments of the presently disclosed surgical instrument and DLU
will now be described in detail with reference to the drawings, in
which like reference numerals designate identical or corresponding
elements in each of the several views.
Referring to FIG. 1, surgical instrument 500 includes a handle
portion 510, a body portion 512, and a disposable loading unit
("DLU") 16. Handle portion 510 includes a stationary handle 514 and
a movable handle or trigger 516. Movable handle 516 is movable in
relation to stationary handle 514 to advance a control rod 520
which projects from the distal end of body portion 512. Handle
portion 510 and body portion 512 may be constructed in the manner
disclosed in U.S. Pat. No. 6,330,965 which is hereby incorporated
herein in its entirety by reference. Alternately, other surgical
instruments can be used with DLU 16 to perform endoscopic surgical
procedures.
Referring to FIGS. 1 and 1A, briefly, DLU 16 includes a tool
assembly 17, a proximal body portion 200 and a mounting assembly
202. Body portion 200 has a proximal end adapted to releasably
engage the distal end of a surgical instrument 500 (FIG. 11) in the
manner to be discussed in detail below. Mounting assembly 202 is
pivotally secured to a distal end of body portion 200 and is
fixedly secured to a proximal end of tool assembly 17. Pivotal
movement of mounting assembly 202 about an axis perpendicular to a
longitudinal axis of body portion 200 affects articulation of tool
assembly 17 between a non-articulated position in which the
longitudinal axis of tool assembly 17 is aligned with the
longitudinal axis of body portion 200 and an articulated position
in which the longitudinal axis of tool assembly 17 is disposed at
an angle to the longitudinal axis of body portion 200.
Referring to FIGS. 2-4, tool assembly 17 includes a cartridge
assembly 18 and an anvil assembly 20. Anvil assembly 20 includes an
anvil portion 28 having a plurality of staple deforming concavities
30 (FIG. 4) and a cover plate 32 secured to a top surface of anvil
portion 28. Cover plate 32 and anvil portion 28 define a cavity 34
(FIG. 4) therebetween which is dimensioned to receive a distal end
of a drive assembly 212 (FIG. 3). Cover plate 32 encloses the
distal end of drive assembly 212 to prevent pinching of tissue
during actuation of DLU 16. A longitudinal slot 38 extends through
anvil portion 28 to facilitate passage of a retention flange 40 of
drive assembly 212. A camming surface 42 formed on anvil portion 28
is positioned to engage a pair of cam members 40a supported on
retention flange 40 of drive assembly 212 to effect approximation
of the anvil and cartridge assemblies. A pair of pivot members 44
are formed. A pair of stabilizing members 50 engage a respective
shoulder 52 formed on carrier 48 to prevent anvil portion 28 from
sliding axially in relation to staple cartridge 54 as camming
surface 42 is pivoted about pivot members 44.
Cartridge assembly 18 includes carrier 48 which defines an
elongated support channel 56 which is dimensioned and configured to
receive staple cartridge 54. Corresponding tabs 58 and slots 60
formed along staple cartridge 54 and elongated support channel 56,
respectively, function to retain staple cartridge 54 at a fixed
location within support channel 56. A pair of support struts 62
formed on staple cartridge 54 are positioned to rest on side walls
of carrier 48 to further stabilize staple cartridge 54 within
support channel 56. Carrier 48 has slots 46 for receiving pivot
members 44 of anvil portion 28 and allowing anvil portion 28 to
move between spaced and approximated positions.
Staple cartridge 54 includes retention slots 64 (FIG. 2) for
receiving a plurality of staples or fasteners 66 and pushers 68. A
plurality of laterally spaced apart longitudinal slots 70 extend
through staple cartridge 54 to accommodate upstanding cam wedges 72
of an actuation sled 74 (FIG. 2). A central longitudinal slot 76
extends along substantially the length of staple cartridge 54 to
facilitate passage of a knife blade 78 (FIG. 4). During operation
of surgical stapler 10, drive assembly 212 abuts actuation sled 74
and pushes actuation sled 74 through longitudinal slots 70 of
staple cartridge 54 to advance cam wedges 72 into sequential
contact with pushers 68. Pushers 68 translate vertically along cam
wedges 72 within fastener retention slots 64 and urge fasteners 66
from retention slots 64 into staple deforming cavities 30 (FIG. 4)
of anvil assembly 20.
Referring to FIG. 3, mounting assembly 235 includes an upper
mounting portion 236 and a lower mounting portion 238. A centrally
located pivot member 284 extends from upper mounting portion 236
through a respective opening 246a formed in a first coupling member
246. Lower mounting portion 238 includes a bore 239 for receiving
pivot member 284 (see FIG. 3F). Pivot member 284 extends through
bore 239 and opening 247a of a second coupling member 247. Each of
coupling members 246, 247 includes an interlocking proximal portion
246b, 247b configured to be received in grooves 290 formed in the
distal end of an inner housing which is formed from upper and lower
housing halves 250 and 252. Coupling members 246, 247 retain
mounting assembly 235 and upper and lower housing halves 250 and
252 in a longitudinally fixed position in relation to each other
while permitting pivotal movement of mounting assembly 235 in
relation thereto.
Referring to FIGS. 3A-3C, each coupling member 246, 247 includes a
cantilevered spring arm 246c which has a distal end 246d positioned
to engage mounting assembly 235. More specifically, upper mounting
portion 236 includes a top surface 236a which includes a recess
236b dimensioned to receive distal end 246d of spring arm 246c of a
respective coupling member 246. Lower mounting portion 238 includes
a bottom surface 238a having a pair of raised surfaces 238b which
define a recess 238c which is dimensioned to receive spring arm
247c of a respective coupling member 247. Alternatively, at least
one recess may be formed in the proximal end of tool assembly
17.
As illustrated in FIGS. 3D-3G, when distal end of spring arms 246c,
247c of coupling members 246, 247 are positioned in recesses 236b
and 238c of upper and lower mounting portions 236 and 238,
respectively, spring aims 246c, 247c retain mounting assembly 235
in a non-articulated position. Spring arms 246c, 247c will retain
mounting assembly 235 in its non-articulated position until a
predetermined force sufficient to deflect spring arms 246c from
recesses 236b and 238c is applied to effect articulation of
mounting assembly 235 and tool assembly 17. When the predetermined
force is applied to the mounting assembly 235 and tool assembly 17,
spring arms 246c, 247c will spring or deflect outwardly from
recesses 236b and 238c, as shown in FIGS. 3E and 3G, to permit
pivotal movement of mounting assembly 235 (and, thus, tool assembly
17) in relation to the distal end of proximal body portion 200 of
the DLU 16.
As discussed above, spring arms 246c and recesses 236b and 238c
maintain tool assembly 17 in its non-articulated position until a
predetermined force has been applied to mounting assembly 235 to
disengage spring arms 246c, 247c from recesses 236b and 238c of
mounting assembly 235. It is envisioned that the spring
arms/recesses could be incorporated into any articulating surgical
device including staplers, graspers (See FIG. 3H), powered sealing
devices, e.g., RF sealing devices, etc. Further, although two
spring arms/recesses are shown, a single spring arm can be
provided. Moreover, the articulating tool assembly need not form
part of a DLU but rather can be supported directly on the distal
end of a surgical instrument. For example, the mounting assembly
can be removably or irremovably secured to the tool assembly and
secured directly to the distal end of a surgical instrument.
Upper housing half 250 and lower housing half 252 are contained
within an outer sleeve 251 of body portion 200 (FIG. 3). Body
portion 200 includes a cutout 251a dimensioned to receive a boss or
projection 250a formed on upper housing half 250. The positioning
of projection 250a within cutout 251a prevents axial and rotational
movement of upper and lower housing halves 250 and 252 within outer
sleeve 251 of body portion 200. In one embodiment, boss 250a has a
substantially rectangular configuration having a greater axial
dimension than lateral dimension. The greater axial dimension
provides increased surface area for preventing rotation of upper
and lower housing halves 250 and 252 within sleeve 251. A proximal
portion 250b of boss 250a is ramped. Ramped proximal portion 250b
allows sleeve 251 to be slid over boss 250a as upper and lower
housing halves 250 and 252 are positioned within sleeve 251. It is
envisioned that boss 250a may assume other configurations, e.g.,
circular, square, triangular, etc., and still achieve its intended
function. Further, boss 250a can be repositioned anywhere along
upper housing half 250 or, in the alternative, be positioned on
lower housing half 252 or partly on each housing half 250 and
252.
The proximal end or insertion tip 193 of upper housing half 250
includes engagement nubs 254 for releasably engaging the distal end
of a surgical instrument in a bayonet-type fashion (see FIGS. 1A
and 7). Housing halves 250 and 252 define a channel 400 for
slidably receiving axial drive assembly 212 therein. An
articulation link 256 is dimensioned to be slidably positioned
within a slot 402 formed between upper and lower housing halves 250
and 252. A pair of H-block assemblies 255 are positioned adjacent
the distal end of housing portion 200 and adjacent the distal end
of axial drive assembly 212 to prevent outward buckling and bulging
of drive assembly 212 during articulation and firing of surgical
stapling apparatus 10. Each H-block assembly 255 includes a
flexible body 255a which includes a proximal end fixedly secured to
body portion 200 and a distal end fixedly secured to mounting
assembly 235 (FIG. 3).
A retention member 288 is supported on engagement section 270 of
axial drive assembly 212. Retention member 288 includes a pair of
fingers 288a which are releasably positioned within slots or
recesses 252a formed in lower housing half 252. In operation, when
SULU 16 is attached to a surgical instrument and axial drive
assembly 212 is actuated by applying a predetermined force to an
actuation member 516 of the surgical instrument 500 (FIG. 11),
axial drive assembly 212 is advanced distally to move drive
assembly 212 and retention member 288 distally. As retention member
288 is advanced distally, fingers 288a are forced from recesses
252a to provide an audible and tactile indication that the surgical
instrument has been actuated. Retention member 288 is designed to
prevent inadvertent partial actuation of DLU 16, such as during
shipping, by maintaining axial drive assembly 212 at a fixed
position within DLU 16 until a predetermined axial force has been
applied to axial drive assembly 212.
Axial drive assembly 212 includes an elongated drive beam 266
including a distal working head 268 and a proximal engagement
section 270. In one embodiment, drive beam 266 is constructed from
multiple stacked sheets of material. Engagement section 270
includes a pair of resilient engagement fingers 270a and 270b which
mountingly engage a pair of corresponding retention slots formed in
drive member 272. Drive member 272 includes a proximal porthole 274
configured to receive distal end of a control rod 520 (FIG. 11) of
a surgical instrument when the proximal end of DLU 16 is engaged
with the body portion 512 of a surgical instrument 500.
Referring also to FIGS. 5-10, DLU 16 further includes a locking
mechanism including a locking member 300 and a locking member
actuator 302. Locking member 300 (FIG. 6) is rotatably supported
within a longitudinal or axial slot 310 (FIG. 7) formed in a
proximal portion of upper housing half 250 of body portion 200 of
DLU 16. Locking member 300 is movable from a first position (FIGS.
7 and 8), in which locking member 300 maintains drive assembly 212
in a prefired position, to a second position (FIGS. 9 and 10), in
which drive assembly 212 is free to move axially.
As illustrated in FIG. 6, locking member 300 includes
semi-cylindrical body 312 which is slidably positioned within
transverse slot 310 formed in upper housing half 250 of body
portion 200. Body 312 includes a radially inwardly extending cam
member 314 and a radially inwardly extending finger 316. Finger 316
is dimensioned to be slidably received within a notch or slot 270c
(FIG. 3) formed in drive assembly 212. Engagement of finger 316 in
notch 270c of drive assembly 212 prevents drive assembly 212 from
moving linearly within body portion 200 and, thus, prevents
actuation of DLU 16.
Referring to FIGS. 3, 5 and 7, a locking member actuator 302 is
slidably positioned within a axial slot 320 (FIG. 7) formed in
upper housing half 250 of body portion 200 of DLU 16. Actuator 302
includes a proximal abutment member 322, a distal spring guide 324,
and a central cam slot 326. Axial slot 320 intersects transverse
slot 310 such that cam member 314 of locking member 300 is slidably
positioned within cam slot 326 of locking member actuator 302. A
biasing member or spring 328 (FIG. 7) is positioned about spring
guide 324 between a distal surface 330 of actuator 302 and a wall
332 (FIG. 7) defining the distal end of axial slot 320. Spring 328
urges actuator 302 to its retracted position within axial slot 320.
In its retracted position, abutment member 322 is positioned on and
extends radially outwardly of the proximal end of DLU 16 adjacent
insertion tip 193 of proximal body portion 200 and cam slot 326 is
positioned to locate cam member 314 such that finger 316 of lock
member 300 is positioned within notch 270c of drive assembly
212.
FIGS. 11-15 illustrate DLU 16 and surgical instrument 500 prior to
and during attachment of DLU 16 to surgical instrument 500. Prior
to attachment of DLU 16 onto surgical instrument 500, spring 328
urges actuator 302 to its retracted position to move lock member
300 to its locked position as discussed above. When insertion tip
193 DLU 16 is linearly inserted into the open end 522 (FIG. 11) of
the body portion 512 (FIG. 13) of a surgical instrument 500, nubs
254 move linearly through slots (not shown) formed in open end 522
of body portion 512. As nubs 254 pass through the slots, the
proximal end 322a of abutment member 322, which is angularly offset
from nubs 254, abuts a wall 276c defining the slots for receiving
nubs 254. As DLU 16 is moved further into body portion 512, locking
member actuator 302 is moved from its retracted position to its
advanced position in the direction indicated by arrow "T" in FIG.
14. As actuator 302 is moved to its advanced position, lock member
300 is cammed in the direction indicated by arrow "U" in FIG. 14
from its locked position (FIG. 8) engaged with drive assembly 212
to its unlocked position (FIG. 10) to move finger 316 from notch
270c. The locking mechanism including locking member 300 and
locking member actuator 302 prevents accidental or inadvertent
advancement or manipulation of the drive member of DLU 16 such as
during loading of DLU 16 onto a surgical instrument 500.
When DLU 16 has been moved linearly in relation to instrument 500
to a position wherein a proximal surface 530 of body portion 200
abuts inner surface 276c of body portion 512 (FIG. 15), DLU 16 can
be rotated in relation to body portion 512 in a bayonet-type action
to position nubs 254 within openings 536 of body portion 512 to
lock DLU 16 onto body portion 512. It is envisioned that other
coupling types besides bayonet couplings may be used to connect DLU
16 to instrument 500, e.g., spring detent or snap-fit couplings,
friction fit couplings, interlocking members, threaded couplings
etc.
In an embodiment of the present disclosure illustrated in FIGS.
16-20, a locking assembly 600 is illustrated for use with surgical
instrument 500 and disposable loading unit 16 (see FIG. 1, for
example). In the illustrated embodiments, locking assembly 600
includes a housing 602, a pusher 604, a rod 606, a slide 608, at
least one spring 610, a cam finger 612, a pivot plate 614 having
slots 616 and a link 618. Locking assembly 600 generally helps tool
assembly 17 (see FIG. 1, for example) maintain its position during
firing of surgical instrument 500.
Referring to FIGS. 16 and 17, a portion of locking assembly 600 is
at least partially contained within a housing 602. FIG. 16
illustrates locking assembly 600 disposed in relation to housing
602, while FIG. 17 illustrates locking assembly 600 isolated from
housing 602. In the illustrated embodiment of FIG. 17, pusher 604
is shown with rod 606 extending distally therefrom. Slide 608
extends distally from rod 606 and is in a slidable relationship
therewith, thus allowing slide 608 to move axially with respect to
rod 606. Spring 610 or pair of springs (not explicitly shown in
this embodiment) distally biases slide 608 from rod 606.
Now referring to FIGS. 18-20, cam finger 612 and pivot plate 614
are illustrated. Cam finger 612 extends distally from slide 608 and
pivot plate 614 may be disposed on mounting assembly 235 (see FIG.
3), for example. It is envisioned that pivot plate 614 may be
disposed on or incorporated with a portion of tool assembly 17. A
plurality of slots 616 (five slots 616 are illustrated) is disposed
on pivot plate 614 and are sized to accept at least a portion of
cam finger 612 therein. Upon different amounts of articulation of
tool assembly 17 (including no substantial articulation) with
respect to body portion 512 (see FIG. 1, for example), cam finger
612 is approximately aligned with an individual slot 616 of pivot
plate 614. FIGS. 18 and 19 illustrate cam finger 612 substantially
aligned with a center slot 616a (hidden from view in FIG. 19) and
FIG. 20 illustrates cam finger 612 substantially aligned with a
side slot 616b.
Link 618, illustrated in FIGS. 17 and 19, is in mechanical
engagement with pivot plate 614 and cam finger 612. (In FIG. 18,
the link has been removed.) Link 618 is illustrated having an
opening 620 and a slot 622 (FIG. 19). Opening 620 is in a pivotal
relationship with a boss 624 on pivot plate 614 and slot 622 is
slidably engaged with cam finger 612. This relationship allows for
articulation of pivot plate 614 with respect to body portion 512
and for longitudinal translation of slide 608 with respect to pivot
plate 614.
In operation, upon at least a partial actuation of movable handle
516 (see FIG. 1, for example), pusher 604 is forced distally, e.g.,
via control rod 520 (see FIG. 11, for example), thus causing distal
translation of cam finger 612 at least partially into a slot 616 of
pivot plate 614. It is envisioned that actuating movable handle 516
to approximate cartridge assembly 18 and an anvil assembly 20 (see
FIG. 1A, for example) also functions to translate cam finger 612
distally. In such an embodiment, when articulating tool assembly 17
is in place and clamped on tissue, further articulation cannot be
accomplished (without releasing movable handle 516, for example).
Thus, locking assembly 600 helps maintain articulating tool
assembly 17 in position with respect to body portion 512, prior to
emplacing staples into tissue, for example.
As discussed above, spring 610 distally biases slide 608 from rod
606. This biasing provided by spring 610 helps ensure cam finger
612 is not accidentally or prematurely dislodged from slot 616 of
pivot plate 614, which may result in a significant amount of "play"
therebetween. Additionally, the distal bias provided by spring 610
helps eliminate manufacturing tolerances and/or clearances that are
present between slide 608 and pivot plate 614. It is also
envisioned that at least a portion of cam finger 612 and/or slot
616 may be wedge-shaped to help reduce any unintended movement
therebetween. In such an embodiment, a distal portion of cam finger
612 and slot 616 would be narrower than a corresponding proximal
portion.
In an embodiment of the present disclosure illustrated in FIGS. 21
and 22, a locking assembly 700 is illustrated for use with surgical
instrument 500 and disposable loading unit 16 (see FIG. 1, for
example). In the illustrated embodiment, locking assembly 700
includes an adapter 702, a pusher 704, a pivot 706, a biasing
element (e.g., a pair of springs 708) and a link 710. Locking
assembly 700 generally helps maintain tool assembly 17 in a
predetermined position.
With reference to FIG. 21, adapter 702 of locking assembly 700 is
generally housed within body portion 512 (see FIG. 1, for example)
of surgical instrument 500 or within disposable loading unit 16. In
the illustrated embodiment, pusher 704 is located distally of a
pair of springs 708. Pusher 704 is distally biased via the pair of
springs 708 towards pivot 706 of articulating tool assembly 17. A
distal portion of pusher 704 includes a pusher mating surface 712
(FIG. 22) which is shaped and dimensioned to mate with a pivot
mating surface 714 (FIG. 22) disposed adjacent a proximal portion
of pivot 706. Link 710 is illustrated in mechanical cooperation
with a portion of pusher 704 and pivotably connected to a portion
of pivot 706, thus allowing articulating tool assembly 17 to move
between its first position and its second position with respect to
body portion 512. More specifically, link 710 includes an opening
711 that fits over a protrusion 707 of pivot 706, thus allowing
pivotal movement therebetween. Further, link 710 is slidably
engaged with a portion of adapter 702, thus allowing longitudinal
movement therebetween.
Now referring to FIG. 22, pusher mating surface 712 is
substantially flat along a majority of its length in this
embodiment. Correspondingly, pivot mating surface 714 is also flat
along a majority of its length in the illustrated embodiment. Thus,
the distal bias of pusher 704 towards pivot 706 (in the direction
of arrow A) via the pair of springs 708, helps maintain
articulating tool assembly 17 in its first, non-articulated,
position, as the biasing force helps articulating tool assembly 17
resist pivoting. While two springs 708 are illustrated, more or
fewer springs 708 may be provided.
To pivot articulating tool 17 from its first, non-articulated
position, the distal biasing force from pair of springs 708 must be
overcome. Such a pivoting action, moves pusher 704 proximally (in
the direction of arrow B) against the bias of pair of springs 708.
It is also envisioned that pusher mating surface 714 includes
detents (not explicitly shown in this embodiment) to help stabilize
articulating jaw member 17 in selected articulated positions.
With continued reference to FIG. 22, pivot 706 includes a shelf 716
thereon. As shown in FIG. 22, shelf 716 overlaps at least a portion
of pusher 704 when pusher mating surface 712 is in contact with
pivot mating surface 714. Shelf 716 is situated and configured to
help prevent tissue from being pinched between pusher 704 and pivot
706 when articulating tool assembly 17 is rotated and/or
articulated.
In an embodiment of the present disclosure illustrated in FIGS.
23-25, a multi-layered drive beam 750 having a plurality of layers
750a-750e is illustrated and may be included in a disposable
loading unit 16 (see FIG. 1, for example). A closure apparatus 760,
such as an I-beam, is also illustrated. Closure apparatus 760
includes a horizontal portion 762 that is advanceable into camming
surface 42 (or other contact surface) to approximate tool assembly
tool assembly 17, as described in detail above with reference to
FIG. 2.
With reference to FIG. 24, multi-layered drive beam 750 having five
layers 750a-750e is illustrated. It is envisioned and within the
scope of the present disclosure that fewer or more layers may be
used to form multi-layered drive beam 750. It is also envisioned
that multi-layered drive beam 750 may replace drive beam 266 in
other embodiments of this disclosure. Use of multi-layered drive
beam 750 may provide increased strength and flexibility during use,
specifically, for instance, while tool assembly 17 is in an
articulated position.
A plurality of cutouts 770 is illustrated in FIGS. 23-25 which
extend through each layer of multi-layered drive beam 750. Although
the figures show between five and ten cutouts per layer of
multi-layered drive beam 750, the exact number of cutouts 770 may
be fewer than five, between five and ten, or greater than ten.
Additionally, cutouts 770 of adjacent layers of drive beam 750 may
or not align with each other. The use of cutouts 770 reduces
cross-sectional dimensions of drive beam 750 and allows for bending
force adjustment. While rectangular cutouts 770 are illustrated,
the use of cutouts 770 having other regular or non-regular shapes
is also contemplated.
The attachment of each layer 750a-750e of multi-layered drive beam
750 and the attachment to closure apparatus 760 are illustrated in
FIG. 25. In the illustrated embodiment, an outer layer (750a or
750e of FIG. 24) is affixed to closure apparatus 760 in two
locations (each location being indicated by numeral 780 in FIG.
25), via a pair of spot welds, for example. It is also envisioned
that each outer layer 750a, 750e includes an aperture 776 that fits
over a boss 778 protruding from closure apparatus 760. Each outer
layer 750a, 750e is also affixed to an adjacent layer (e.g., 750b
or 750d) in two locations (each location being indicated by numeral
781 in FIG. 25), possibly via a pair of spot welds. Further, each
inner layer (e.g., 750b, 750c and 750d) is attached to an adjacent
inner layer (for instance, 750b is attached to 750c; 750c is
attached to 750b and 750d; and 750d is attached to 750c) in two
locations, via spot welds, for example. While spot welding is
disclosed as an attachment method, other methods for attaching each
layer to each other and the outer layers to the closure apparatus
are envisioned and within the scope of the present disclosure. The
illustrated embodiments show attachments points 780 of inner layers
adjacent closure apparatus 760, but it is envisioned and within the
scope of the present disclosure that attachment points 780 are
disposed in other locations on drive beam 750. Additionally, it is
envisioned that at least one layer of drive beam 750 is made of a
metal, such as stainless steel. Portions of drive beam 750 and/or
closure apparatus 760 may also be made of or at least partially
coated with a plastic material, as described below. Further,
closure apparatus 790 may include a cutting surface 766 (FIG. 23)
thereon for cutting tissue.
In an embodiment of the present disclosure illustrated in FIGS. 26
and 27, a closure apparatus 800 and a portion of drive beam 802 are
shown. Closure apparatus and/or a contact surface (e.g., camming
surface 42) of tool assembly 17 (see FIG. 2, for example) may
include a plastic surface or plastic coating. In this embodiment,
closure apparatus 800 is illustrated having a pair of caps 804 at
least partially covering horizontal portions 806 of closure
apparatus 800. Caps 804 may be made of plastic in this embodiment.
Such plastic surfaces disposed on closure apparatus 800 and/or
contact surface of tool assembly 17 generally reduce the amount of
friction therebetween vis-a-vis two metal surfaces. That is, a
plastic to metal or a plastic to plastic interaction may create
less friction than interaction between a pair of metal surfaces.
This reduced amount of friction may correspond to a reduced firing
force.
It is envisioned that a portion of closure apparatus 800, such as
pair of caps 804, is made of plastic, overmolded with plastic or
includes a plastic coating. Additionally, a contact surface of tool
assembly 17, or at least a portion thereof, may also be made of
plastic, be overmolded with plastic or include a plastic
coating.
In an embodiment of the disclosure, closure apparatus 800 may
include an I-shaped cross section, as illustrated in FIGS. 26 and
27. Additionally, closure apparatus 800 and drive beam 802 may be
part of a disposable loading unit 16 and/or part of a surgical
instrument 500 that is able to articulate. Further, drive beam 802
may include a single layer or a plurality of layers (as shown in
FIG. 26) and at least a portion of drive beam 802 may be made of
plastic. Still further, closure apparatus 800 may include a cutting
surface 808 (FIG. 27) thereon for cutting tissue.
With continued reference to FIGS. 26 and 27, plastic cap 804 may
include a reinforced section 810 which may increase the strength of
closure apparatus 800 or may provide a stronger connection between
cap 804 and horizontal portion 806 of closure apparatus 800. It is
also envisioned that cap 804 may be removably attached to closure
apparatus 800. In such an embodiment, cap 804 may be removed and
replaced if any substantial wearing or damage occurs.
In an embodiment of the present disclosure illustrated in FIGS. 28
and 29, a tool assembly 850 is illustrated. Tool assembly 850 of
this embodiment includes a channel 852, a first attachment member
860, a second attachment member 870, an anvil assembly 880, a first
attachment rod 890 and a second attachment rod 892. First and
second attachment rods 890, 892 provide a strong connection
facilitating the elements of tool assembly 850 to remain
together.
Channel 852 includes an opening 854 (two openings are illustrated)
adjacent its proximal end and first attachment member 860 includes
a boss 862 (two bosses are illustrated) extending therefrom.
Channel 852 is connectable to first attachment member by placing
opening(s) 854 over boss(es) 862, thus providing a pivotal
connection therebetween. Although not explicitly illustrated in the
present embodiment, channel 852 may house a plurality of surgical
fasteners or a staple cartridge.
Anvil assembly 880 includes an anvil cover 882 and an anvil 886.
Anvil 886 is configured for mechanical engagement with anvil cover
882, e.g., via a snap-fit connection. An aperture 884 extends at
least partially through a portion of anvil cover 882. Aperture 884
is configured to fit over a protrusion 872 disposed on second
attachment member 870, thereby providing a connection between anvil
assembly 880 and second attachment member 870. Additionally, anvil
cover 882 includes at least one opening 888 extending at least
partially therethrough in an embodiment of the disclosure. Opening
888 is configured to fit over boss 862 of first attachment member
860. In such an embodiment, anvil assembly 880 may be pivoted with
respect to first attachment member 860 and second attachment member
870.
First attachment member 860 includes a first opening 864 and a
second opening 866 extending therethrough. Second attachment member
870 also includes a first opening 874 and a second opening 876
extending therethrough (FIG. 29). Further, first attachment member
860 and second attachment member 870 are in mechanical engagement,
such that first openings 864, 874 substantially align and second
openings 866, 876 substantially align.
To secure first attachment member 860 with second attachment member
870 (and thus channel 852 and anvil assembly 880), first attachment
rod 890, or a portion thereof, is inserted through first openings
864 and 874. To further secure the elements of tool assembly 850,
second attachment rod 892, or a portion thereof, is inserted
through second openings 866 and 876. It is envisioned that first
attachment rod 890 and/or second attachment rod 892 are rivets,
such as two-part rivets that are tightenable.
In an embodiment of the disclosure, tool assembly 850 is part of a
disposable loading unit, which may be able to articulate.
Articulation of tool assembly 850 may be facilitated by pivotably
attaching tool assembly 850 to a body portion of a surgical
instrument via protrusion 874 extending from second attachment
member 870 and a link (such as link 710 in FIG. 21). Additionally,
a method of assembling tool assembly 850, as described above, is
contemplated by the present disclosure.
It will be understood that various modifications may be made to the
embodiments disclosed herein. For example, the above-described lock
assembly may be incorporated into a variety of surgical instruments
which include DLUs and is not limited to use on linear staplers.
Further, the DLU may be configured to receive an insertion tip of
surgical instrument in contrast to that disclosed. Therefore, the
above description should not be construed as limiting, but merely
as exemplifications of various embodiments. Those skilled in the
art will envision other modifications within the scope and spirit
of the claims appended hereto.
* * * * *